[3] Near its mouth the river enters a long, brackish lagoon that is separated from the sea by a sand and pebble spit.

[2] The river flows along this spit, which holds a fishery, for about 2 miles (3.2 km) before entering the sea.

[4][a] In the first Russian maps from the beginning of the 18th century the river is named Chikcha, Chikchin, Chiuchin, Kykhchik, etc.

[8] The chum salmon ascend the rivers for spawning between June and September, with the greatest numbers in July or August.

[2] A 1987 study found that migratory arctic char in the Kikhchik River had a fecundity fork length at age five of 325 millimetres (12.8 in) and a life span of ten years.